Q1.A uniform force of (2iˆ+ ˆj) N acts on a particle of mass 1 kg. The particle displaces from position (3 ˆj + ˆk ) m to (5iˆ+ 3ˆj) m. The work done by the force on the particle is
Answer : Option CExplaination / Solution: No Explaination.
Q2.A ball of mass 1 kg and another of mass 2 kg are dropped from a tall building whose height is 80 m. After, a fall of 40 m each towards Earth, their respective kinetic energies will be in the ratio of
Answer : Option DExplaination / Solution: No Explaination.
Q3.A body of mass 1 kg is thrown upwards with a
velocity 20 m s−1. It momentarily comes to rest after attaining a
height of 18 m. How much energy is lost due to air friction?. (Take g= 10ms-2
)
Answer : Option AExplaination / Solution: No Explaination.
Q4.An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water of the jet. What is the rate at which kinetic energy is imparted to water ?.
Answer : Option AExplaination / Solution: No Explaination.
Q5.A body of mass 4 m is lying in xy-plane at rest.
It suddenly explodes into three pieces. Two pieces each of mass m move
perpendicular to each other with equal speed v. The total kinetic energy generated due to explosion is
Answer : Option BExplaination / Solution: No Explaination.